Android中自定义下拉样式Spinner
本文继续介绍android自定义控件系列，自定义Spinner控件的使用。
实现思路
1.定义下拉控件布局（ListView及子控件布局）
2.自定义SpinerPopWindow类
3.定义填充数据的Adapter
效果图
一、定义控件布局<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android=""android:layout_width="match_parent"android:layout_height="match_parent"android:background="#f2f2f2"android:orientation="vertical"android:padding="5dp" ><LinearLayoutandroid:id="@+id/layout"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="5dp"android:background="#cbcbcb"android:orientation="vertical"android:padding="0.2px" ><RelativeLayoutandroid:layout_width="wrap_content"android:layout_height="42dp" ><TextViewandroid:id="@+id/tv_value"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_centerVertical="true"android:layout_marginRight="50dp"android:background="#fff"android:ellipsize="end"android:gravity="left|center"android:hint="请选择"android:paddingLeft="10dp"android:singleLine="true"android:textColor="#ff000000"android:textSize="18dp" ></TextView><LinearLayoutandroid:id="@+id/bt_dropdown"android:layout_width="50dp"android:layout_height="match_parent"android:layout_alignParentRight="true"android:background="#fff"android:gravity="center"android:onClick="onClick" ><ImageViewandroid:layout_width="20dp"android:layout_height="15dp"android:background="@drawable/down_arrow" /></LinearLayout></RelativeLayout></LinearLayout></RelativeLayout>二、定义SpinerPopWindow类package org.gaochun.widget;import java.util.List;import org.gaochun.R;import org.gaochun.adapter.SpinerAdapter;import org.gaochun.adapter.SpinerAdapter.IOnItemSelectListener;import android.content.Context;import android.graphics.drawable.ColorDrawable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.PopupWindow;/** * 自定义SpinerPopWindow类 * @author gao_chun * */public class SpinerPopWindow extends PopupWindow implements OnItemClickListener{private Context mContext;private ListView mListView;private SpinerAdapter mAdapter;private IOnItemSelectListener mItemSelectListener;public SpinerPopWindow(Context context){super(context);mContext = context;init();}public void setItemListener(IOnItemSelectListener listener){mItemSelectListener = listener;}public void setAdatper(SpinerAdapter adapter){mAdapter = adapter;mListView.setAdapter(mAdapter);}private void init(){View view = LayoutInflater.from(mContext).inflate(R.layout.spiner_window_layout, null);setContentView(view);setWidth(LayoutParams.WRAP_CONTENT);setHeight(LayoutParams.WRAP_CONTENT);setFocusable(true);ColorDrawable dw = new ColorDrawable(0x00);setBackgroundDrawable(dw);mListView = (ListView) view.findViewById(R.id.listview);mListView.setOnItemClickListener(this);}public void refreshData(List<String> list, int selIndex){if (list != null && selIndex != -1){if (mAdapter != null){mAdapter.refreshData(list, selIndex);}}}@Overridepublic void onItemClick(AdapterView<?> arg0, View view, int pos, long arg3) {dismiss();if (mItemSelectListener != null){mItemSelectListener.onItemClick(pos);}}}三、定义Adapterpackage org.gaochun.adapter;import java.util.List;import org.gaochun.R;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;public class SpinerAdapter extends BaseAdapter {public static interface IOnItemSelectListener{public void onItemClick(int pos);};private List<String> mObjects;private LayoutInflater mInflater;public SpinerAdapter(Context context,List<String> mObjects){this.mObjects = mObjects;mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);}public void refreshData(List<String> objects, int selIndex){mObjects = objects;if (selIndex < 0){selIndex = 0;}if (selIndex >= mObjects.size()){selIndex = mObjects.size() – 1;}}@Overridepublic int getCount() {return mObjects.size();}@Overridepublic Object getItem(int pos) {return mObjects.get(pos).toString();}@Overridepublic long getItemId(int pos) {return pos;}@Overridepublic View getView(int pos, View convertView, ViewGroup arg2) {ViewHolder viewHolder;if (convertView == null) {convertView = mInflater.inflate(R.layout.spiner_item_layout, null);viewHolder = new ViewHolder();viewHolder.mTextView = (TextView) convertView.findViewById(R.id.textView);convertView.setTag(viewHolder);} else {viewHolder = (ViewHolder) convertView.getTag();}//Object item = getItem(pos);viewHolder.mTextView.setText(mObjects.get(pos));return convertView;}public static class ViewHolder{public TextView mTextView;}}四、调用示例public class MainActivity extends Activity implements OnClickListener,SpinerAdapter.IOnItemSelectListener{private List<String> mListType = new ArrayList<String>(); //类型列表private TextView mTView;private SpinerAdapter mAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_search);mTView = (TextView) findViewById(R.id.tv_value);//初始化数据String[] names = getResources().getStringArray(R.array.array_name);for(int i = 0; i < names.length; i++){mListType.add(names[i]);}mAdapter = new SpinerAdapter(this,mListType);mAdapter.refreshData(mListType,0);//显示第一条数据//mTView.setText(names[0]);//初始化PopWindowmSpinerPopWindow = new SpinerPopWindow(this);mSpinerPopWindow.setAdatper(mAdapter);mSpinerPopWindow.setItemListener(this);}//设置PopWindowprivate SpinerPopWindow mSpinerPopWindow;private void showSpinWindow(){Log.e("", "showSpinWindow");mSpinerPopWindow.setWidth(mTView.getWidth());mSpinerPopWindow.showAsDropDown(mTView);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.bt_dropdown:showSpinWindow();break;}}/* (non-Javadoc)* @see org.gaochun.adapter.SpinerAdapter.IOnItemSelectListener#onItemClick(int)*/@Overridepublic void onItemClick(int pos) {// TODO Auto-generated method stubif (pos >= 0 && pos <= mListType.size()){String value = mListType.get(pos);mTView.setText(value.toString());}}}
源码下载：
五、自定义控件系列
Android项目中使用自定义进度加载Dialog：
ListView中按钮监听器 设置 及 优化：
Android项目中自定义顶部标题栏：
Android自定义设置圆形图片控件：
android自定义底部Tab，，项目整体界面框架：
自定义AlertDialog提示框：
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